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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration /L) Well Elevation to Water Elevation Thickness Ethyl- ' _ Number Date (feet) (feet) (feet) - (fect) Benzene Toluene benzene Xylenes TPH-g MTBE MW 10 06/28/04 725 <0 5* MW 10 09/27/04 725 2I 36 -14 11 000 -- -- -- __ -- MW 10 09/28/04 725 -- -- -- 118 17 0 7 6 2 1,190 h 119 MW10 09/28/04 725 <0 5* MW 10 12/01/04 725 2092 -1367 000 19 0 28 2 2 86 1,320 h 14 8 MW10 12/01/04 725 <0 5* MW 10 03/24/05 725 1895 -1170 000 -- -- -- -- -- __ MW10 03/25/05 725 -- -- -- 203 2 0 10 4 8 1,270 h 6 4 MW10 03/25/05 725 <0 5* MW 10 06/22/05 725 1861 -1136 000 114 14 12 41 1,040 h 115 MW10 06/22/05 725 <1* MW10 10/12/05 725 2042 -1317 000 -- -- -- __ -- MW10 10/13/05 725 -- -- -- 10 <5.0 <5 0 <5 0 1,100 h <25 MW 1 l 05/02/91 1015 3839 -2824 000 <0 3 <0 3 <0 3 <1 <50 -- MWI 1 07/16-17/91 10 15 3938 -2923 000 <0 5 <0 5 <0 5 <0 5 <50 -- MWI.1 10/15/91 10 15 39 94 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 1 I 01/28/92 10 15 3808 -2793 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 1 I 04/30/92 10 15 3772 -2757 000 <0 5 <0 5 <0 5 <0 5 <50 -- MWI 1 08/13/92 10 15 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 11 10/08/92 1015 40 70 -3055 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 11 02/23/93 1015 3728 -27 13 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW11 05/18/93 1015 -- -- -- -- -- __ -- MWI 1 -MW11 08/22/93 10 15 36 19 -2604 000 MWI 1 12/30/93 10 15 Not accessible -- -- -- -- -_ -- MWI 1 _MW11 11/11/97 10 15 2483 -1468 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW 11 11/11/97 10 15 <2 0* MW 11 03/03/98 10 15 2011 -996 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW 11 03/03/98 to 15 <2 0* MWI 1 05/20/98 1015 1858 -843 000 <0 5f <0 5f <0 5f <0 5f <50f <2 5f MW 11 05/20/98 1015 <2 0* MWI 1 08/19/98 1015 1994 -979 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW11 08/19/98 10 15 <2 0* g 1pro)ects173942Vnasterlwplg 100513942gw xls Page 25 of 58